[Towertalk] Guy Anchor Question

In a message dated 9/3/02 9:23:51 PM Pacific Daylight Time,
na9d@speakeasy.net writes:
> I am shortly going to be putting up my first real tower - 5 sections of Rohn
> 25.
>
> I plan on guying the tower with two sets of guys per Rohn specs. My
> question is about anchoring them. I have purchased Rohn GA5604 screw
> anchors. The specs on these say that they have 2500 pounds worth of
holding
> power. I was actually surprised when I received them at how small the
screw
> portion was.
>
> My question is this: Are these sufficient for my tower installation or do
I
> need to think about digging a hole and putting these anchors in concrete?
I
> was originally planning on doing this but now I am wondering if I need to
go
> through all that extra work.
No, they're not sufficient. Yes, do the extra work.
Fifty-feet of 25G has 2 sets of guys; the maximum guywire strength at the
anchor before failure is 8,000 pounds. This is SIGNIFICANTLY more than the
capacity of the screw-in anchors. Even if you used one screw-in per guy,
you'd still have a mismatch. I'll sure someone will mention screw-in creep
due to wet soil conditions.
Concrete uber alles.
Cheers,
Steve K7LXC
TOWER TECH